Upper Limb 2 Station 1 - Anterior Arm and Musculocutaneous Nerve

Question 1

What is the name of the long bone in the arm?

Answer 1

Humerus

Question 2

Answer 2

Question 3

What two compartments is the arm split into?

Answer 3

Anterior/Flexor and Posterior/Extensor

Question 4

“The anterior compartment has (X) important muscles which mainly act on the BLANK joint and the BLANK BLANK-BLANK joint”

Answer 4

“The anterior compartment has THREE important muscles which mainly act on the ELBOW joint and the SUPERIOR RADIO-ULNAR joint”

Question 5

Fill in the blanks

Answer 5

Answers

Question 6

Short head of the bicep originates where?

Answer 6

The coracoid process of the scapula

Question 7

Long head of the bicep originates where?

Answer 7

The supraglenoid tubercle of the scapula

Question 8

Both bicep heads insert where?

Answer 8

Radial tuberosity via the bicipital aponeurosis.

Question 9

Coracobrachialis originates and inserts where?

Answer 9

Originates from the coracoid process of the scapula.

Attatches to the medial side of the humeral shaft at the level of the deltoid tubercle (which is on the anterior side)

Question 10

Brachialis origin and insertion?

Answer 10

Originates from the medial and lateral surfaces of the humeral shaft

Inserts into the ulna tuberosity on ulnar bone - just distal to the elbow joint.

Question 11

Action of the biceps on the elbow/shoulder and superior radio-ulnar joint?

Answer 11

SRU - Supination

Elbow/Shoulder - Flexion

Question 12

Action of the coracobrachialis?

Answer 12

Flexion of the arm at the shoulder

Question 13

Action of the brachialis?

Answer 13

Flexion at elbow

Question 14

Innervation of biceps, coarcobrachialis and brachialis muscles?

Answer 14

Musculocutaneous nerve

Question 15

What segmental cerviag fibres mainly innervate the biceps brachii?

Answer 15

C6

Question 16

Which cord of the brachial plexus does the musculocutaneos nerve arise and what roots make up this cord ?

Answer 16

Lateral (C5.C6.C7)

Question 17

Describe the route of the musculocutaneous nerve in the arm?

Answer 17

Perforates the coraco-brachialis muscle continuing to desend between the biceps and the brachialis

Question 18

What does the musculocutaneous nerve change into as it enters the forearm? Why is it called this?

Answer 18

Lateral cutenous nerve

Carries cutaneous sensations from lateral aspect of the forearm only